I'm going to start a little studio!

I've got the ideas to start a little studio, I have always wanted that! So, starting a studio isn't that easy I only have a electric piano (Yamaha DGX 640) but I want a microphone a electric guitar and a speaker from +/- 20 watt. I wan't a cheap beginner set for the guitar because I am not that great with playing guitar, but for microphone I want a pretty good one from like €50,00 I already saw one the Samson Q2U set. But I don't know what's good, do you guys have any advice or tips starting a little studio because I am not really good at making the right choices so please comment and tell me what you think! Here are some pictures of the things I like: